Apparatus for drawing patterns from molds.



10.327,416.- t l PATENTBD JULY 31,'1906. J. H. B. BRYAN.

APPARATUS FOR` DRAWING-PATTERNS FROM MOLDS.

` PyLIoATIoN Hummm. 11,1900.

W HHBETsf-SYHBBT 1.

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.l K jf fy nis Nomus Plrzks co., wasmnlamuf'n. c,

10.827,4'16. "RATRNTBD JULY31,1906.

J. R. B. BRYAN.

` I APPARATUS TOR DRAWING PATTERNS PROM Mor-JDS.

APPLICATION FILED DBO. 11,1000. I

2 SHEETS-SHEET 2.

` A citizen fof the Unitedv with its pole, .to `an Iarmature von the pattern by'closing the electric .circuit containing the.

- UNITED STATES FP ATENT oFFroE.

Tomi/ZZ @E12/0m .it met?) 0011/067111@Y y y 33e itknown that I, JOHN B.; BRYAN, a

falo,

speciication` l u y'The .obj ect of .this .invention is .to produce an Aelectric lifting lapparatus Vwhereby. pat-y magnetand which is 'mountedLon a -lvertically andy y,horizontally moya-ble support, lwhereby the magnet,together with the pattern, may

- be. -rst liftedl until theI pattern Vis iwithdrawn 1Jrom 4the sand lthe -lask and then movedlaterally, lso .as .to fclear the space labove the flask-fand permit Ythe molder to operate freely.; -ln vthe -.accornpanyingfdrawings, consisting partly -in secton, .jofmy Yimproved pattern. lifting apparatus, showing .the pattern lifted.` 2 fis a top ,pian view-of the same. Figf isa lVertical section,.on an ienlarged scale, Aof

the \electrom'agnet vand lconn'ectingv parts,

showing the position `of .the fparts preparatory to `liti-,ing the ymagnet and the pattern. 4= .-isa fiiragmentary'vertical section of* the slackifconnection ory coupling between-the magnetfand :the movable support, the section being taken at right-angles to Fig-3. Fig. `5v isf'a horizontal section in vline'5 5 Fig. 3.. Fig.4

' 6 is a bottom iplan Viewof the louter-sleeve of v B `vrepresents a horizontally-movable .sup-

port `or ffram'efwhich is arranged' above the molding-bench 'and -which consista essentially, 'ofanuprigh-t shaft l), 4provided with `an upper arm by an Iintermediate ,arm .-52,5 and fa l' specification fmette'rs .Paten-s.

Applicationiiled December lll.. 190.0. `.Srial'Nol39.579.. u

y States; residing-.at Bu'fin the county -of Erie ,and State of New t Yorlnf-haye.invented new and -useful-m- .proMemen-.tsin Apparatus .for Drawingy PatternsfromfMolds, offwhich the following is a lowerjarm t3, rv'vhichproj,eet"forward the shaft, andy an upright brace bf? connecting' tlie intermediate and .lower farms-.h2Y y b vis :j ournaled in bearings Yc cl-,zaso -asato .oaf pablo of .turning horizontally-these bearings being Fsecured yto a .walL@ post, :on:otherfsLipf-V port :C .in vrear .of Ithe @molding-bench. f

D represents .an,.upri gvht h'ollow l llftinjgrod. which isnajpable ofsliding vertically? guides` dd at *the outer ends .of lower arms 52.53.

This rod is" raiSQd .andglowi end to the rock-.shaft b. The weight iolsh I liftingerod :and .the partsrconnected Ttherew "th 1 is .counterbalan/ced by a weighted arm pw-A roted at itsreareIid-:to the t .an-d' .cion- *onthe u ppernarm b.. s v y y l u y 4-Uponl .the lower Kendwof the liftingvrod-an 1 electric iattaching deyice .ismounted,l where* by the pat-.tern to be drawn from thefhnold `is f' connected withl fthe fliiting-rod'faI-id.iwhichlis oonstructedzas follows: Y Y .represents anelectromagnet,I 'thejccorefg of which -is arranged yertica'lly andqfhasjfa j spool .gll lon its lower end which I:carries .the surrounding :coil of wire ivg2. 'Theiendsgof `the electromagnet-.coil .are connected 'with two wires 1h Jp., which :are rarranged in the hollow L'liting-rod and the hollow np erfpart ff l core. The wirehis connecter- "thonepo fe ofan `.electr-ic' generator` H,"wh e vthe futher' pole thereof is connect'ed fbya 'wire'fhz-'witha contact/1'l 'on a switchboardl. vS'Ihe wvfiren-L is -connected- *with .a nominally-'swinging switch-.lever J, whichispiyotedon the switohboard` and adapted-:to `engage :its arm fj `oridisengage the samenffrom .the :contact .ty-,ier

closirigfor opening the circuit, whichinoludes theelectric:generatorland Jthezelectromagnet. rF-he switchboard-,is mount-ed on' thelower end i per vend tofthe-upper lar-m of the horizone tally-rocking lirzrfme, so' l:that theswitchb'oard fmoveswith'th'eframe. p f l i represents a Vertical shipper-rod;- which f moves lup and down the lifting-.rod .and lvwhich-is rovidedwith .two etap ets whereby t e switch-lever .is turnedlliforfantoe -lma-tically v.opening and .closingfthevelectric circuit. The shi per-.rodisi-'.adjustablywfsecured by a screw, 2toanarrnJ.on.thenpper l part ofthezlifting-rod. IF-he i-tappets cflcZ vare b3. 5 Thefshaiit theintermediagtevand 1 nectedat its 'front end with-thefliltngsrxjid r aichainf, which `passes .overaa:.guifleapulleyfy ered by means :of a' Lhand-ieyer'Eywilnioh1-:is l I.-pivgotally connected tnear .kits rontzendato' the i lifting-,rod wand loosely 4.connecteci-at rea-r' IOO ofafvertic'al rod if, which ,is's'ecurodk at its aip-4 IIO arranged above and .below a pin or projection j on the arm jz of the switch-lever. The lower tappet k is preferably formed integrally withthe shipper-rod; but the upper tappet c is adjustably secured thereto by a set-screw kt The position of the tappets is so adjusted relatively to the lifting-rod that the upper tappet cengages withV the pin of the switch-lever and turns the arm thereof into engagement with the contact i during the last part of the downward movement of the lifting-rod, thereby closing the electric circuit and energizing the magnet, and during the last part of the upward movement of the lifting-rod the lower tappet 7c engages the pin of the switch-lever and turns the same so as to disengage its arm from the j contactt, thereby breaking the e ectric circuit and denergizing the magnet.

L represents an iron plate secured to the upper side of the pattern Z and forming an armature which is attracted by the pole of the magnet, and whereby the pattern is connected with the lifting device.

In order to permit of a slight variation or unevenness in the position of the armatureplate, the pattern, or the flask, the magnet is bly connected with theI core of the magnet, so that the pole-piece can adjust itself to any unevenness which may exist in these parts. The pole-piece is preferably of circular form, as shown in Figs. 3 and 7, and is secured to the under side of a flexible disk of metal m. The latter is separated from the lower end of the coil and the core preferably by an interprosed washer m', so as to give the pole-piece eedom of movement. The flexible disk and the washer are secured to the core by a screw m2 passing centrally through the disk.

When the switch is operated automatically by the vertical movement of the lifting-rod, it is necessary to provide means which permit the magnet during its descent to engage its pole-piece with the armature on the pattern before the circuit is closed. Otherwise the magnet if energized while. approaching closely to the pattern-armature would be liable to attract the armature and lift the pattern unevenly or displace the same, thereby distorting the mold and defeating the advantage sought to be gained by the use of this apparatus. For this purpose the electromagnet is connected loosely with the lifting-rod by a slack `connection or coupling, which permits the lifting-rod after the same has lowered the magnet upon the patternarmature to continue its descent a short distance independent of the magnet, and the upper tappet k is so adjusted that it turns the switch-lever and closes the circuit during the time that the lifting-rod moves downwardly independently of the ma net.

The slack connection etween the liftingrod and the magnet for this purpose, which is shown in the drawings, is constructed as follows: The core of the magnet projects above the coil, so as to form a stem N, and the latter is provided at its upper end with an outwardly-projecting flange n. O represents a coupling head or sleeve which is arranged around the upper end of the magnetstem and secured at its upper end by a screw connection with an enlargement at the lower end of the lifting-rod. The lower end of the coupling-sleeve is provided with an inwardlyprojecting flange 0, which is adapted to be engaged by the flange rnl of the magnet-stem. While the molder is packing the sand around the attern inthe flask the magnet is elevated byt e lifting-rod, and the movable supporting-frame, together with the parts mounted thereon, is swung to one side, so as to )ermit the molder to operate freely. Whi e the j magnet is thus elevated by the lifting-rod it is supported by means of the shoulder n on its stem engaging with'the shoulder o of the cou ling-sleeve.

After the pattern has been ac ed in the sand of the flask and the latter as been turned on the bench, so that the pattern, with the armature-plate, is on the upper side, the movable supporting-frame is shifted provided with a pole-piece M, which is flexiso that the electromagnet 1s arranged with l its pole-piece over the armature-plate of the pattern.

The lifting-rod, together with the magnet carried thereby, is now lowered, during the first part of which movement the position of the switch-lever is such that the t electric circuit is open and the magnet is inactive. Before the lifting-rod reaches the end of its downward movement the polepiece of the magnet engages the armatureplate of the pattern, whereby the further downward movement of the magnet is arrested. During the continued downward movement of the lifting-rod to the end of its stroke in this direction the cou ling-sleeve on the lifting-rod slides down on t e magnetstem, as shown in Fig. 3. While the liftingrod is thus moving downward independent y of the magnet the upper tappet 7c engages the switch-lever and turns the same sufficiently IOO IIO

to engage the contact i, thereby closing the electric circuit and rendering the magnet active, whereby the latter attaches its polepiece to the armature-plate of the pattern by electromagnetic attraction. Upon now raising the lifting-rod the internal shoulder o of the coupling-sleeve engages with the external shoulder n of the magnet-stem, whereby the magnet and the pattern are lifted and the latter is withdrawn from the sand mold in the flask, as shown in Fig. 1. This movement is perfectly vertical, so that the pattern is drawn upwardly in a straight line, thereby producing a erfect mold o the pattern in the sand of t e flask. During the last part of the upward movement of the lifting-rod the lower tappet k turns the switch-lever so as to open the electric circuit, thereby denreducing the-nent mold. AThe from turning on the lifting-rod consist of one or more splines or keys p, to -the Aouter side yof lthe magnet-stem and engaging with notches or recesses p in the interflange o of the coupling-sleeve, as shown in Eigs.. 15a-nd l5.

secured lengthwise :In Iorder to ypreven'tt'he lifting-rod and-the par-ts connected therewith from being moved suddenly and rjarring themachine and the `mold,v a y'ci'lshioning device is provided, which iScGnstructed as follows: l(.Qrep'resentsfan airthe intermediate ar?)2 'of the rocking frame, and g is a plunger arranged in the cylinder and-'provided with arod g', which is pivoted at its lower end to the lifting-lever E, I"as shown in Figs. l and8, The 'upper `head of the cylinder is provided with a small lhole 1, the lower head thereof is provided with one or more largevholes s, and the side or bore of the cylinder is provided with a large hole t, compared with the hole in the up er head. Upon depressing the hand-lever E for engaging the magnet with the pattern-plate the plunger is moved toward the lower end of the cylinder. As the plunger passes downwardly below the side opening tin the cylinder air is admitted 4freely above the plunger and reduces the tendency to forma vacuum above the plunger which would have to be overcome by the operator. The air in the cylinder below the plunger escapes through the lower openings s sufficiently free to permit of engaging the magnet promptly with the pattern-plate; but the escape of the air through .the openings s is retarded sufficientlyto offer a slight resistance to the'downward movement of the magnet and prevent jarring the pattern. 'During the first part vof the upward movement of the plunger, together with ,the lifting-rod, theair in the u per end of the cushion-cylinder escapes free y through the side opening t, thereby permitting the pattern to be lifted comparatively fast until the plunger passes above the side opening t. The last part of the upward movement of the cylinder which is pivoted at its upper end to plunger and the lifting-rod is checked or cushioned by reason of the slow escape of the air from the u per end of the cylinder through the sma l upper opening r after the plunger passes above the side opening t. By thus cushioning thelifting-rod and connecting parts during the last part of the upward movement thereof the o erator can release the hand-lever E aftter t e pattern has beenopened and closed, and means w yswitch is Ioperated automatically while the released from the'magnet, and the upward' movement Vof the parts will be `completed lby the weighted .arm F without jarring thefapyparatus. Any lubricating-oil which may dropv from the guides of the lii'r'ting-rodlis ranged on 4topof the magnet', thereby preventing the oil from reaching the pole-piece and y interfering with the attraction of the magnet.

I claim as my invention-- l. vThe combination of a vertically-movyable lifting-rod, an electromagnet, guidedevices whereby the lifting-rod is caused to v7e caught by a drip or waste pan u, which is 'ari move in a vertical line, a switch whereby the electric circuit containing the maglnet nay ere" y sail lifting-'rod lmoves vertically,

'substantially as set forth.

2. The combination with a vertically-movablelifting-rod, and a guide 'wherebyy the same is guided-in its vertical movement, vof an electroinagnet mounted on said rod, a switch having a lever wherebythe `electric circuit containing the magnet may be opened andY closed, andtappets which move with the lifting-rod-,and whereby the switch-lever is operated, substantially as set forth.

3. The combination with a vertically-mov-y able lifting-rod anda horizontally-movable 9 frame rovided with guides whereby the liftd) is guided in its vertical movement, of` v ing-ro an electromagnet mounted on the lifting-rod,

a switchboard mounted on the movable frame and provided with a switch-lever whereby may be opened and closed, and tappets which move with the lifting-rod and whereby the switch-lever is turned for opening and closing said circuit, substantially as set forth.

4. from molds the combination with a verticallymovable support, and means for guiding the support and causing it to move in avertical line, of an electromagnet mounted on said support and provided with a yielding polepiece adapted to attach itself to an armature on the pattern, substantially as set forth.

5. In an apparatusfor drawing patterns from molds the combination with a verticallymovable support, ofa magnet mounted on said support, and a pole-piece connected with IOO the electric circuit containing the magnet lOS In an apparatus for drawing patterns v the core of the magnet by a flexible disk and able support, of a magnet havin a slack connection with said support so t at the support can move independently of the magnet when the latter is arrested, a switch which is adapted to open and close the electric circuit containing the magnet, and means for operating said switch while the support moves independently of the magnet, substantially as set forth.

8. The combination with a vertically-movable lifting-rod, and an electromagnet, of a coupling whereby a slack connection is formed between the lifting-rod and the magnet and which comprises one member connected with the lifting-rod and having a projecting part and another member arranged on the magnet and having a projecting part which is adapted to engage said other projecting part, a switch whic is arranged in the circuit containing said ma net, and means for operating said switch whi e the lifting-rod moves indepenilently ofthe magnet, substantially as set ort 9. The combination with a liftin -rod and an electromagnet, of a coupling w ereby a slack connection is produced between the magnet and lifting-rod so as to ermit the rod to move independently of tlie magnet when the latter is arrested and which is pro'- vided with a spline whereby the magnet is held against turning on the lifting-rod, a

'switch which is arranged in the electric circuit containing the magnet, and means for operating said switchwhile the lifting-rod moves independently of the magnet, substantially as set forth.

l0. The combination with a lifting-rod, and an electromagnet, of a stem projecting upwardly from the magnet and provided with an external flange, a couplin g-sleeve surrounding the stem and secured at its upper end to the'lifting-1od and at its lower end provided. with an internal [lange having a notch, which flange is adapted to be engaged by the external flange of the magnet-stem, a key or spline arranged on said stem and engaging with the notch in the iiange of the coupling-sleeve, a switch having a lever and arranged in an. electric circuit containing the magnet, and tappets moving with the lifting-rod and adapted to turn said switch-lever for opening and closing the electric circuit, substantially as set forth.

Witness my hand this 23d day of November, 1900.

JOHN H. B. BRYAN Witnesses:

NATHAN M. CLARK, HORACE H. FLAGLER. 

